Radosław Załuska

Administration of on-premise Magento 2 environments for various e-commerce projects

Administration of projects deployed on the Magento Cloud environment and close cooperation with dedicated AWS support

Debian Linux administration and maintenance

Creating Bash and Python scripts for automation

Development of various Python scripts for solving data, infrastructure and automation problems

Working with full Magento 2 technology stack in terms of automatic deployment using Jenkins, configuration using Ansible and administration. (technology stack components: HAProxy, Varnish Cache server, NGINX, PHP 7, Postfix, RabbitMQ, Redis, MySQL, Docker, Jenkins)

Planning and performing server software updates focusing on the low-user impact and stability of migration

Using GIT SCM to store the source code of projects and DevOps tools

Plainning releases together with developers and collecting git commits into release packages

Using Gerrit and Gitlab for storing GIT repositories. Administration of Gerrit server. Migration of GIT projects from Gerrit to Gitlab.

Media files CDN implementation using Cloudflare

Syncing backup files to Amazon S3 Buckets using AWS-CLI

Administration of Akeneo PIM software deployed on on-premise and cloud clusters (PHP, Elastic-Search, MySQL, Docker).

Setup, administration, fine-tuning, monitoring, and automatic backup of MySQL databases

Migration of e-commerce websites clients and orders with cleanup and automatic data correction using SQL queries

Fixing and cleaning database data broken by bugs and legacy code

Automation of preparing stripped development databases based on production data

Monitoring of environments using InfluxDB, Telegraf, Grafana, and New Relic

Logs aggregation and monitoring with Filebeat and Graylog

Maintaining Jenkins pipeline for automatic end-to-end web application tests based on the Playwright framework

Performance and stress testing of services using Apache JMeter

Design of virtual machine clusters using the best cluster options available based on cost constraints and expected end-user traffic

Setup of Linux servers environments on VMware VCloud using Ansible and Terraform

Vmware VCloud IPv4 network administration

Public DNS administration (Cloudflare, home.pl)

Using Certbot (Let's Encrypt) for automatic SSL certificates generation

Administration of Redmine project management software

Tracking the progress of tasks using Redmine project management software.

Estimating CPU, RAM, and disc requirements for new projects and in preparation for traffic peaks

Helping developers deal with local environment-related tasks (docker-compose) and Linux-related problems

Working as the first line of support and helping distribute tickets to proper teams. Performing root cause analysis of critical bugs

Debugging performance issues and finding bugs in backend and frontend of applications (tcpdump, strace, pt-query-digest, Chrome performance tools, Lighthouse)

Successfully working in a multi-project environment with frequent changes between projects and the fast-paced environment with fast-changing requirements

Carrying out processes of onboarding new developers with LDAP accounts maintenance and introduction of tools and technologies used in the company

Preparation and maintenance of local developer's environments using docker-compose and custom MySQL dump scripts

Promotion and implementation of DevOps automation best practices in the company

Successfully working remotely 100% of the time

Working with clients from Poland, Romania, the Czech Republic, and Croatia using Polish and English languages for communication

Using Ansible for configuring Oracle Linux and Windows servers.

Administration and maintenance of Oracle Linux virtual machines.

Created and managed Jenkins pipelines for various projects in Linux and Windows environments.

Maintenance of Jenkins Shared Library used as a common source of Groovy code and functions for all Jenkins pipelines

Used Bash and Python to write automation tools.

Worked in an international Scrum team following Scrum processes with communication in the English language

Usage and administration of Gitlab server for storing GIT repositories. Using Ansible for automatic configuration of projects, groups, and users on Gitlab.

Close cooperation with company CIO admins on a multi-team level. Coordination of servers update and maintenance

Cooperation with developers during the implementation of the automatic deployment of Java and Scala apps using Docker Swarm.

Development of custom Ansible modules.

Jenkins cluster management and maintenance.

Administration of Artifactory server. Removing old Docker images from it using a custom Python script.

Maintenance of Dockerfiles used for building applications. Maintenance of Jenkins CI Pipelines used for building and deploying Docker images to Artifactory.

Confluent Kafka and Zookeeper clusters management, maintenance, and monitoring using Control Center. Schema Registry automatic deployment using Jenkins.

Elastic Search, Kibana, Logstash, and Filebeat management and maintenance. Using ELK stack for logs aggregation and monitoring.

Maintenance of HashiCorp Consul and HashiCorp Vault clusters used for service discovery and secrets management.

Monitoring the infrastructure using Zabbix, Prometheus, and Grafana with automatic alerts send to Slack

Administration of HAProxy server integrated with Consul service discovery server using custom dockerize script. Implemented HA solution using two HAProxy servers and round-robin DNS load balancing

Ceph FS - distributed file system - deployment, administration, and production usage as data storage for Docker Swarm

Selenium cluster maintenance (Windows and Linux). Maintenance of environment for testing the Windows desktop app with Robot Framework

Active Directory users and groups management

Troubleshooting problems with builds, Docker Swarm services, servers, and network

Used Jira and Confluence for issue tracking and knowledge sharing.

Successfully working remotely 100% of the time from March 2020

Managed WMware infrastructure cluster and Ubuntu Linux virtual servers.

Managed an Avamar backup server. Created custom scripts for automated backup status retrieval.

Set up and manage of SAS servers cluster.

Created and managed a web application for VMware infrastructure monitoring (Python / Django / Perl).

Created, deployed, and managed two API systems for Public Data Hackathon (09.2016) (Python / SQLAlchemy / Flask / Docker) Used NoSQL Redis database as a cache for application responses, which has improved its performance.

Rewritten part of sist.itl.waw.pl web app from PHP to Python (Django).

Managed widok.gov.pl and simba.itl.waw.pl web apps as a sysadmin.

Jenkins CI server management and administration.

Migrated data about books and borrows from legacy library system into modern application (Koha Library Software).

Integrated Active Directory authentication with a private VCloud system using LDAP protocol.

Implemented dynamic DNS configuration in private VCloud system using VMware API and Dnsmasq.

Deployed and managed custom NGINX HTTP server installation with ModSecurity WAF (Web Application Firewall) plugin using docker.

Upgraded and secured legacy Joomla CMS installation (v1.5 into v3.8) and MediaWiki installation (v1.15 into 1.25).

Managed and configured Cacti SNMP infrastructure monitoring server.

Introduced, deployed, and managed the Gogs Git server used as a repository for internal tools and projects. Replaced the old method of storing repositories as directories on the Linux server.

Basic Postfix MTA, DNS, and DHCP servers management and configuration